Now, we're going to turn to the latest in the shocking georgia murder trial. The defendant in this case is acting as his own attorney. 17 years after the crime he's accused of. And it was an emotional day in court on tuesday, when he cross-examined the young man of the young mother he is accused of killing, the same young man he's accused of attacking. Steve osunsami has the story. The person in the room, grabbed me and started stabbing me a bunch. Reporter: Nicholas smith was fighting back tears. Telling his story, on all all days, his mother's birthday. I thought she was home. And I -- I went downstairs. And she wasn't there. Reporter: He was just 5 years old in 1995, when prosecutors say his mother, karmen smith, a delta flight attendant, was strangled by waseem daker, on trial for that murder, and acting as his own attorney. Police say daker was wearing a mask. Waited all day for the boy to come home and stabbed him 18 times. Smith showed his wounds to jurors. He covered my mouth. And thpt stabbing me. And then, I just got up and fainted. Reporter: Police say all of this was an act of revenge against his mother's roommate, loretta blatz, who helped send daker to jail for stalking her. I could see when they ran past the window in my room. But it was still really dark in my room. And the windows were closed. Reporter: When it was daker's turn to ask questions, it would be smith's first exchange with the man he believes tore his life to pieces. Do you remember telling them that the killer's eyes were blue. No. I was in the hospital and had gotten stabbed repeatedly by you. So, I don't really think that was a very good time to be asking a 5-year-old questions like that. The truth is, sometimes we just have to stand up to someone who attacked us. And who changed our lives, just to even say, I am standing up to you. Reporter: Daker is fighting new dna evidence that tied him to the murder. And faces a life in prison. It's possible he could take the stand in his own defense this week, even though he's his own lawyer. For "good morning america," steve osunsami, abc news, atlanta.

This transcript has been automatically generated and may not be 100% accurate.

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